"Oshiri Tantei" series, a fun picture book for preschoolers and elementary school students. - Series Name: Oshiri Tantei - Author: Troll - Number of Books: 18 in total - Language: Japanese - Target Age: For preschoolers and elementary school students - Illustrations: Color illustrations Thank you for looking. My child has stopped reading them, so I'm selling them as a set, hoping that children who still love Oshiri Tantei will enjoy them. * "The Bride Targeted by the Phantom Thief" is a duplicate, so there are two copies.